Solvent for acetyl cellulose.



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No Drawing.

UNITED STATES PATENT OF ICE.

WILLIAM G. LINDSAY, OF NEW YORK, N. Y., ASSIGNOR TO THE CELLULOIDCOMPANY,

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OF NEW YORK, N; Y., A CORPORATION OF NEW JERSEY.

i To all whomz't may concern a citizen of the United States, residing inthe city of New York, county of New York, State of New York, haveinvented certain new and useful Improvements in Solvents for .AcetylCellulose, of which the following is a specification.

The various compositions to which the plresent invention relates areemployed in tie arts mainly as imitations of natural substances andconsist of cellulose derivatives combined with or dissolved in certainother substances or menstrua, known as solvents and diluents. 1

Although the final or useful form of the different compounds isthat of asolid or dried material, the different processes of conversion into thisfinal solid form involve, as is well understood, the employment ofsolutions or mixtures of varying consistencies as to plasticity,stiffness or fluidityj de endent generally on the proportion and liindof solvent'used to the amount of cellulose. J

There are two classes of solvents,liquid solvents, of which chloroform,epichlorhydrin and acetone are good examples; and it is possible to usemy new solvent with what are known as solid solvents, such as camphor,for instance. The components of the mixed solvents may not necessarilybepossessed of individual solvent power. As an illustration, alcohol,which is practically a non-solvent in itself of nitro cellulose, forms agood solvent if either ether or camphor be mixed with it- The variousapplications of this important artrequire the employment of complexmixtures in the solvent,single substances being rarely used for suchpurposes. Hence, while the advancementof the art has, as is well known,depended largely on the discovery and application of -new* singlesolvent substances, it has required also the invention Bf combinationsof solventsby which effects are produced quite different from thoseproduced. when single solvents are employed alone.

Specification of Letters Patent.

creases.

Patented as 28,1912.

Application filed August 10, 1911. Serial No. 643,374.

ethylenechlorid is not a solvent of the ace- K tone-soluble variety ofacetyl cellulose, it becomes such a solvent upon admixture either withethyl or methyl alcohol.

As an illustration, I have discovered that a mixture of ethylenechloridB. P. 83. 5 (1.

and methyl alcohol in the proportion of two I "half parts of methylalcohol (by volume) and one part of ethylenechlorid (by volume) producesa mixture which is a valuable solvent for acetyl cellulose, but if theproportion of ethylenechlorid is increased beyond this amount-thesolvent action de- Still again, I have found that a mixture ofethylenechlorid and ethyl alcohol in equal proportions forms an.efiicient solvent. But I do not limit myself to these specificproportions given in the above examples.

This newsolventmixture described herein can be used either alone or inconjunction with other solvent or non-solvent liquids or solids.

\Vhat I claim and desire to secure by Letters Patent is: y

1. As a new composition of matter, a solution of acetyl cellulose in amixture of ethylenechlorid and alcohol, substantially as described.

2. A new composition of matter consisting of a solution of acetylcellulose in a mixture of ethylenechlorid and alcohol (ethyl or methyl),combined with other solvents, substantially as described.

3. A new composition of matter consist ing of a solution of acetylcellulose in a mixture of ethylenechlorid and alcohol (ethyl or methyl),combined with other solvents and inert or coloring matters andsubstances, substantially as described. I

VILLIAM G. LINDSAY.

Witnesses:

J. E. HiNDoN HYDE, Mania. DENTON.

